To be specific, image annotation can be defined as the procedure of adding and attaching labels to an image to provide transcription of the image and convert it into an informational visual. You can either add a single label to any image or can add multiple labels to various parts of the images as per your requirement to make your image data more informational. The labels or metadata that are attached to the images are used to identify characteristics of the data which you want the machines to analyze and understand.